# Basebuilder2 Crypto Gas Estimate

> Basebuilder2 Crypto Gas Estimate is a paid API for AI agents from bbx-crypto.vercel.app, paid per call via x402, $0.074561/call, status unknown (last checked 2026-10-13).

Estimates blockchain gas fees for a given transaction or network, returning cost projections in crypto units

## Facts

- Endpoint: POST https://bbx-crypto.vercel.app/api/gas-estimate?utm_source=zero.xyz
- Price: $0.074561/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder2-crypto-gas-estimate-9f497ed4
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_481nKMcgVmfznUoJB9ZkE

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability basebuilder2-crypto-gas-estimate-9f497ed4 -d '<json body>'
```

Example prompt: What will the gas fee be for sending 0.5 ETH on the Ethereum mainnet right now — give me estimates for slow, standard, and fast confirmation speeds.

## When to prefer this

Use this endpoint when you need a quick, paid gas estimation without running your own blockchain node, especially on Base or Ethereum networks. Prefer this over free public estimators when reliability and uptime guarantees matter, or when integrating into an automated payment or transaction workflow that requires programmatic access.

## Known failure modes

- Invalid or unsupported chain ID returns 400 error
- Missing required transaction parameters returns validation error
- Network congestion or RPC node unavailability causes timeout
- Malformed contract address returns parsing error
- Insufficient metadata to estimate complex contract interactions

## How this service works

BaseBuilder Crypto API hub - 26 paid endpoints

## Output

Returns a gas cost estimate including base fee, priority fee (miner tip), estimated total gas in gwei, and projected transaction cost in ETH and/or USD, typically broken down by confirmation speed tier (slow/standard/fast).

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder2-crypto-gas-estimate-9f497ed4/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bbx-crypto.vercel.app](https://www.zero.xyz/host/bbx-crypto.vercel.app/llms.txt)